Qucs / qucs / 842

57%

Pull #306

travis-ci

Correct CPW formulae in QucsTranscalc and qucsator

The coplanar waveguide characteristics formulae were incorrect, mainly
due to an incorrect usage of the algorithm used to compute the complete
elliptic integral of the first kind K(); the argument passed to the
function was the elliptic modulus k, while the function was expecting
the parameter m=k^2.
The function providing K(k) was rewritten, in a slightly simpler form,
to accept the elliptic modulus k as input parameter.
The same formulae were corrected in both QucsTranscalc and qucsator.
The Technical Papers document was updated with a short description
of the algorithm used to compute K(k).

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